Dayton Audio has added a waveguide faceplate to the popular ND25 soft dome
to create the ND25FW-4 tweeter. The waveguide faceplate controls dispersion to
minimize ceiling and wall reflections, which in turn leads to an increase in
efficiency across most of the passband.
Key Features
Waveguide loaded 1" treated silk dome
Waveguide provides controlled directivity and higher efficiency
Low Fs of 1,350 Hz can accommodate crossovers as low as 2,500 Hz
Includes foam gasket to ensure a good seal to your enclosure
High-strength neodymium motor with heatsink and ferrofluid cooling
Standard 104 mm diameter faceplate for easy integration into many existing
systems
The Dayton Audio ND25FW-4 tweeter features a unique integrated round
waveguide faceplate that provides a controlled directivity transition at high
frequencies, reducing the effect of room reflections on the speaker's tonal
balance. Unlike conventional flat-faceplate dome tweeters whose directivity does
not match the midwoofer driver near the crossover frequency, the ND25FW-4's
waveguide is curved to maintain consistent directivity at the transition. The
waveguide also acts as a low-compression horn, lowering distortion.
Waveguide-loaded dome tweeters are embraced within the industry for
providing directivity control and mild horn loading without the negative effects
of compression loading such as impulse smear and throat distortion where high
levels are not needed. The waveguide profile used in the ND25FW-4 provides a
minimum dispersion angle of about 90 degrees, and maintains directivity control
to about 2,000 Hz, but the round waveguide will install easily into the same 104
mm standard tweeter cutout used commonly by dome tweeters with larger ferrite
motors.
Specifications:
• Power handling: 20 watts RMS/40 watts max
• VCdia: 1"
•
Le: 0.04 mH
• Impedance: 4 ohms
• Re: 3.2 ohms
• Frequency response:
2,500-20,000 Hz
• Fs: 1350 Hz
• SPL: 91 dB 1W/1m
• Dimensions: Overall diameter:
4.09", Cutout diameter: 2.875", Depth: 1.57".
Product Specifications
Cone / Dome Diameter 1"
Cutout Diameter 2.875
Tweeter Type Soft Dome
Power Handling (RMS) 20 Watts
Impedance 4Ω
Frequency Response 2,500 to 20,000Hz
Sensitivity 91dB 2.83V/1m
Thiele-Small Parameters
Resonant Frequency (Fs) 1350Hz
DC Resistance (Re) 3.2Ω
Voice Coil Inductance (Le) 0.04mH
Mounting Information
Overall Outside Diameter 4.09"
Depth 1.57"